【转】WPF防止界面卡死并显示加载中效果

<Window x:Class="LoadingTest.MainWindow"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/PResentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"        xmlns:local="clr-namespace:LoadingTest"        mc:Ignorable="d"        Title="MainWindow" Height="350" Width="525">    <Grid>        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="41,20,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />        <DataGrid AutoGenerateColumns="False" Height="99" HorizontalAlignment="Left" Margin="40,70,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="441" />        <Canvas Name="loading" RenderTransformOrigin="0.5,0.5" Visibility="Collapsed" HorizontalAlignment="Center" VerticalAlignment="Center" Width="120" Height="120" Margin="187,76,241,85">            <Ellipse Width="15" Height="15" Canvas.Left="55" Canvas.Top="31" Stretch="Fill" Fill="#FFD1D1F7" Opacity="1.0"/>            <Ellipse Width="15" Height="15" Canvas.Left="38" Canvas.Top="39" Stretch="Fill" Fill="Blue" Opacity="0.8"/>            <Ellipse Width="15" Height="15" Canvas.Left="36" Canvas.Top="58" Stretch="Fill" Fill="#FF0000FE" Opacity="0.7"/>            <Ellipse Width="15" Height="15" Canvas.Left="52" Canvas.Top="67" Stretch="Fill" Fill="Blue" Opacity="0.6"/>            <Ellipse Width="15" Height="15" Canvas.Left="68" Canvas.Top="61" Stretch="Fill" Fill="#FF2E2EFF" Opacity="0.5"/>            <Ellipse Width="15" Height="15" Canvas.Left="69" Canvas.Top="42" Stretch="Fill" Fill="#FF6F6FFF" Opacity="0.4"/>            <Canvas.RenderTransform>                <RotateTransform x:Name="SpinnerRotate" Angle="0" />            </Canvas.RenderTransform>            <Canvas.Triggers>                <EventTrigger RoutedEvent="ContentControl.Loaded">                    <BeginStoryboard>                        <Storyboard>                            <DoubleAnimation Storyboard.TargetName="SpinnerRotate" Storyboard.TargetProperty="(RotateTransform.Angle)" From="0" To="360" Duration="0:0:0.8" RepeatBehavior="Forever" />                        </Storyboard>                    </BeginStoryboard>                </EventTrigger>            </Canvas.Triggers>        </Canvas>        <Label Name="lab_pro" Content="Label" Height="28" Margin="140,14,315,239" />    </Grid></Window>

public partial class MainWindow : Window    {        public MainWindow()        {            InitializeComponent();        }        BackgroundWorker bgMeet;        private void button1_Click(object sender, RoutedEventArgs e)        {            bgMeet = new BackgroundWorker();            bgMeet.WorkerReportsProgress = true;            bgMeet.DoWork += new DoWorkEventHandler(bgMeet_DoWork);            bgMeet.ProgressChanged += new ProgressChangedEventHandler(bgMeet_ProgressChanged);            bgMeet.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bgMeet_RunWorkerCompleted);            bgMeet.RunWorkerAsync();        }        void bgMeet_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)        {            loading.Visibility = System.Windows.Visibility.Collapsed;            this.Dispatcher.Invoke(new Action(() =>            {                this.lab_pro.Content = "完成";            }));        }        void bgMeet_ProgressChanged(object sender, ProgressChangedEventArgs e)        {            this.Dispatcher.Invoke(new Action(() =>            {                this.lab_pro.Content = e.ProgressPercentage;            }));        }        void bgMeet_DoWork(object sender, DoWorkEventArgs e)        {            this.Dispatcher.Invoke(new Action(() =>            {                loading.Visibility = System.Windows.Visibility.Visible;            }));            GetData();        }        public void GetData()        {            for (int i = 0; i < 11; i++)            {                bgMeet.ReportProgress(i);                System.Threading.Thread.Sleep(500);            }        }    }